Anti-coking iron spinel surface

Patent metadata

Field	Value
Publication number	US-12065744-B2
Application number	US-202117512334-A
Country	US
Kind code	B2
Filing date	Oct 27, 2021
Priority date	Mar 1, 2017
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An anti-coking surface having a thickness up to 15 microns comprising from 15 to 50 wt. % of MnCr 2 O 4 (for example manganochromite); from 15 to 25 wt. % of Cr 0.23 Mn 0.08 Ni 0.69 (for example chromium manganese nickel); from 10 to 30 wt. % of Cr 1.3 Fe 0.7 O 3 (for example chromium iron oxide); from 12 to 20 wt. % of Cr 2 O 3 (for example eskolaite); from 4 to 20 wt. % of CuFe 5 O 8 (for example copper iron oxide); and less than 5 wt. % of one or more compounds chosen from FeO(OH), CrO(OH), CrMn, Si and SiO 2 (either as silicon oxide or quartz) and less than 0.5 wt. % of aluminum in any form provided that the sum of the components is 100 wt. % is provided on steel.

First claim

What is claimed is:

1. A process to produce a surface coating on a substrate comprising from 20 to 50 wt. % of Ni and less than 0.05 wt. % of one or more elements chosen from Cu and Al comprising:
applying to not less than 75% of the surface of the substrate a uniform coating comprising not less than 80 wt. % of one or more of copper, and copper oxides, provided elemental copper is present in an amount of less than 10 wt. %, and comprising less than 2 wt. % trace elements including Si, and
heating the surface to a temperature from 500° to 1000° C. for at least 3 cycles under alternating oxidizing atmospheres for a time of at least 15 hours and reducing atmospheres for a time of at least 1 hour;
wherein the uniform coating comprises a copper iron oxide and has a thickness less than 12 microns.

2. A process according to claim 1 , wherein an individual treatment under an oxidizing atmosphere is from 15 to 20 hours.

3. The process according to claim 2 , wherein an individual treatment under a reducing atmosphere is from 1 to 2 hours.

4. The process according to claim 3 , wherein the copper oxide is present in the coating in an amount of not less than 90 wt. % based on the weight of the coating.

5. The process according to claim 4 , wherein the coating is a chemical vapor deposition (CVD) coating.

6. The process according to claim 4 , wherein the coating is a spray coating.

7. The process according to claim 4 , wherein the coating is a laser ablation coating.

8. The process of claim 1 , wherein the substrate comprises the interior surface of a reactor.

9. The process of claim 1 , wherein the copper iron oxide is CuFe 5 O 8 .

10. The process of claim 1 , wherein the uniform coating comprises from 15 to 50 wt. % of manganochromite.

11. The process of claim 1 , wherein the uniform coating comprises from 15 to 25 wt. % of chromium manganese nickel.

12. The process of claim 1 , wherein the uniform coating comprises from 10 to 30 wt. % of chromium iron oxide.

13. The process of claim 1 , wherein the uniform coating comprises from 12 to 20 wt. % of eskolaite.

14. The process of claim 1 , wherein the uniform coating comprises from 4 to 12 wt. % of copper iron oxide.

15. The process of claim 1 , wherein the uniform coating comprises less than 5 wt. % of one or more compounds chosen from FeO(OH), CrO(OH), CrMn, Si and SiO 2 .

16. A process to produce a surface coating on a substrate comprising from 20 to 50 wt. % of Ni and less than 0.05 wt. % of one or more elements chosen from Cu and Al comprising:
applying to not less than 75% of the surface of the substrate a uniform coating, and
heating the surface to a temperature from 500° to 1000° C. for at least 3 cycles under alternating oxidizing atmospheres for a time of at least 15 hours and reducing atmospheres for a time of at least 1 hour;
wherein the uniform coating has a thickness less than 12 microns and comprises 15 to 50 wt. % of manganochromite, from 15 to 25 wt. % of chromium manganese nickel; from 10 to 30 wt. % of chromium iron oxide; from 12 to 20 wt. % of eskolaite; from 4 to 12 wt. % of copper iron oxide; less than 5 wt. % of one or more compounds chosen from FeO(OH), CrO(OH), CrMn, Si and SiO2; and less than 0.5 wt. % of aluminum in any form.

Assignees

• Nova Chem Int Sa

Inventors

• Mah Evan
• Simanzhenkov Vasily
• Benum Leslie
• Farag Hany
• Olayiwola Bolaji

Classifications

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• C23C16/406

  of iron group metals · CPC title

• C23C16/405

  of refractory metals or yttrium · CPC title

• C23C8/60

  using solids, e.g. powders, pastes (using liquid suspensions of solids C23C8/40) · CPC title

• C23C4/11

  Oxides · CPC title